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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P51688: Variant p.Leu163Pro

N-sulphoglucosamine sulphohydrolase
Gene: SGSH
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Variant information Variant position: help 163 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help LP/P [Disclaimer] The variants are classified into three categories: LP/P, LB/B and US.
  • LP/P: likely pathogenic or pathogenic.
  • LB/B: likely benign or benign.
  • US: uncertain significance

Residue change: help From Leucine (L) to Proline (P) at position 163 (L163P, p.Leu163Pro). Indicates the amino acid change of the variant. The one-letter and three-letter codes for amino acids used in UniProtKB/Swiss-Prot are those adopted by the commission on Biochemical Nomenclature of the IUPAC-IUB.
Physico-chemical properties: help Similar physico-chemical property. Both residues are medium size and hydrophobic. The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -3 The score within a Blosum matrix for the corresponding wild-type to variant amino acid change. The log-odds score measures the logarithm for the ratio of the likelihood of two amino acids appearing by chance. The Blosum62 substitution matrix is used. This substitution matrix contains scores for all possible exchanges of one amino acid with another:
  • Lowest score: -4 (low probability of substitution).
  • Highest score: 11 (high probability of substitution).
More information can be found on the following page

Variant description: help In MPS3A; the mutant is enzymatically inactive; rapid degradation rather than decrease in synthesis is responsible for the low steady state level of the mutant protein in cells; the mutant protein shows instability in the lysosomes. Any additional useful information about the variant.


Sequence information Variant position: help 163 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 502 The length of the canonical sequence.
Location on the sequence: help GSVLQVGRNITRIKLLVRKF L QTQDDRPFFLYVAFHDPHRC The residue change on the sequence. Unless the variant is located at the beginning or at the end of the protein sequence, both residues upstream (20) and downstream (20) of the variant will be shown.
Sequence annotation in neighborhood: help The regions or sites of interest surrounding the variant. In general the features listed are posttranslational modifications, binding sites, enzyme active sites, local secondary structure or other characteristics reported in the cited references. The "Sequence annotation in neighborhood" lines have a fixed format:
  • Type: the type of sequence feature.
  • Positions: endpoints of the sequence feature.
  • Description: contains additional information about the feature.
TypePositionsDescription
Chain 21 – 502 N-sulphoglucosamine sulphohydrolase
Glycosylation 151 – 151 N-linked (GlcNAc...) asparagine
Helix 152 – 164



Literature citations
Transport, enzymatic activity, and stability of mutant sulfamidase (SGSH) identified in patients with mucopolysaccharidosis type III A.
Muschol N.; Storch S.; Ballhausen D.; Beesley C.; Westermann J.-C.; Gal A.; Ullrich K.; Hopwood J.J.; Winchester B.; Braulke T.;
Hum. Mutat. 23:559-566(2004)
Cited for: VARIANTS MPS3A CYS-74; ARG-106; PRO-163; ARG-191; TYR-403 DEL AND TRP-433; CHARACTERIZATION OF VARIANTS MPS3A CYS-74; ARG-106; PRO-163; ARG-191; TYR-403 DEL AND TRP-433; CATALYTIC ACTIVITY; FUNCTION; SUBCELLULAR LOCATION;
Disclaimer: Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. They are not in any way intended to be used as a substitute for professional medical advice, diagnostic, treatment or care.